I'm having what appears to be 2 issues, but may be related. I have 2 dishes - one for local channels and the 5LNB dish (I assume slimline). All new cables are running to the HR20 and 1 D11 with existing wires running to the remaining 2 D11's. House is only 5 years old so wiring is all RG6. My HR20 is running to a Denon receiver via hdmi and then to the Sony VPL-VW100 front projector (92" screen). The dishes are mounted on the roof of our 2-story house with no trees anywhere close. They are mounted at the bottom, not the peak of the roof.
On the replacement HR20 I received yesterday, I watched HD channels for about 5 hours straight with no problems. Today, I can't watch 5 minutes without picture and sound breaking up (771 errors). If I restart the receiver, it is fine again for a few hours then starts breaking up again.
On the D11's (all of them) when watching local channels I get picture/sound breaks with images/audio from ESPN or Soap Network cutting in and out. Doesn't matter which local channel. Both techs that have come out have said this is a problem that they have never seen before.
Both problems seem to get worse when all receivers are on, but do appear with only a single set powered up too. I've been dealing with this for 3 weeks, calling and waiting 2-3 days for someone to come out, then waiting another couple of days for equipment to come in, the calling and waiting another couple of days for a tech to come back. Just about ready to throw in the towel

My wife of course blaims me for *having to get more HD than I can watch*

Hope that isn't too long of a post.